All a shim is going to do is give you more bottom end "grunt" at the expense of top end speed right? It'll lower your ratio right through the rev band, if I'm reading it right.Got the Viking out this afternoon and ran it down the road to see how the 2 mods to the primary felt. Hated it and top speed fell from 52 to 45, and it didn’t feel like it accelerated any faster, maybe even slower it just reved out to fast. So I guess I will have to find time to take it apart again. I will put the stock weights back in and maybe just go with .5mm shim.